What Is 4-(2-Oxopyrrolidin-1-yl)benzene-1-sulfonyl Chloride?

4-(2-Oxopyrrolidin-1-yl)benzene-1-sulfonyl chloride (Aladdin SKU: B735382) is an aromatic sulfonyl chloride reagent in which a 2-pyrrolidinone (gamma-lactam) ring is attached to the para position of the benzene ring bearing the sulfonyl chloride group. This bifunctional architecture makes it a versatile synthetic building block: the sulfonyl chloride moiety acts as an electrophilic acylating agent toward nucleophiles such as primary and secondary amines, alcohols, and thiols, while the lactam ring introduces a conformationally constrained, bioisosteric pharmacophore frequently encountered in bioactive molecules.

The compound is catalogued under the reference BD90031 and is primarily intended for use as a research reagent in synthetic organic chemistry and medicinal chemistry workflows.

Handling, Safety, and Storage

As with all sulfonyl chloride compounds, 4-(2-Oxopyrrolidin-1-yl)benzene-1-sulfonyl chloride is moisture-sensitive and should be handled under anhydrous conditions whenever possible. Exposure to water or atmospheric humidity will cause hydrolysis of the sulfonyl chloride group to the corresponding sulfonic acid, reducing reagent efficacy and potentially generating hydrogen chloride gas.

Recommended precautions include: use of appropriate personal protective equipment (gloves, safety glasses, and lab coat); handling in a well-ventilated fume hood; storage in a tightly sealed container under inert atmosphere (nitrogen or argon) in a cool, dry location; and keeping the reagent away from bases, alcohols, and other nucleophilic species prior to use. Consult the Safety Data Sheet (SDS) for full hazard information before use.

Applications in Synthesis and Drug Discovery

The primary application of 4-(2-Oxopyrrolidin-1-yl)benzene-1-sulfonyl chloride is the construction of sulfonamide bonds via reaction with amine-containing substrates. Sulfonamides are a prominent functional group in pharmaceuticals, agrochemicals, and materials science owing to their metabolic stability, hydrogen-bonding capacity, and broad biological activity profiles.

The embedded 2-pyrrolidinone (lactam) motif further enhances the utility of this building block in medicinal chemistry: lactam-containing fragments are associated with improved aqueous solubility, conformational rigidity, and the ability to mimic peptide bond geometry. Researchers commonly employ this reagent in fragment-based drug discovery, parallel synthesis campaigns, and structure-activity relationship (SAR) studies where both the sulfonamide and lactam pharmacophores are desired simultaneously in a single coupling step.

Recommended Reaction Conditions

Sulfonylation reactions using 4-(2-Oxopyrrolidin-1-yl)benzene-1-sulfonyl chloride are typically carried out in aprotic solvents such as dichloromethane (DCM), tetrahydrofuran (THF), or acetonitrile at 0 °C to room temperature. A non-nucleophilic base, such as triethylamine (Et3N) or N,N-diisopropylethylamine (DIPEA), is commonly added in slight excess (1.2–2.0 equivalents) to neutralize the hydrogen chloride generated during the reaction.

The sulfonyl chloride is generally used in slight excess relative to the amine nucleophile (1.0–1.5 equivalents) to ensure complete conversion. Reactions are typically complete within 1–4 hours at room temperature and can be monitored by TLC or LC-MS. Aqueous workup with dilute acid or base facilitates removal of the amine salt and excess base. Note that specific conditions should be optimized empirically for each substrate combination.

Ordering and Availability

4-(2-Oxopyrrolidin-1-yl)benzene-1-sulfonyl chloride is available from Aladdin Scientific under SKU B735382. Researchers and procurement teams can place orders through the Aladdin Scientific website or contact the sales team for bulk pricing, custom packaging, or availability inquiries. For questions related to purity specifications, certificates of analysis (CoA), or regulatory documentation, please reach out to Aladdin Scientific customer support. All products are intended for research use only and are not for diagnostic or therapeutic applications.